DevExpress ASP.NET 使用经验谈（5）-通过ASPxGridView实现CRUD操作

这节，我们将通过使用DevExpress的ASPxGridView控件，实现对数据的CRUD操作。

首先，我们在解决方案中，添加一个网站：

图一添加新网站

图二添加DevExpress.Data.v12.2.dll，DevExpress.Xpo.v12.2.dll，以及XPOModel的引用

图三从工具栏拖放ASPxGridView与XpoDataSource

图四设置XpoDataSource的类型名称 TypeName，先选择控件，右键-属性（或点击右上角小箭头）

图五点击TypeName属性下拉选择

图六选这XPOModel.DemoDB.Users

图七选择ASPxGridView，右键属性（或点击右上角箭头），打开任务属性设置

图八选择DataSource，设置主题，设置分页，可编辑、新增，删除

经过上述设置，Html代码也发生变化，如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
<%@ Register Assembly="DevExpress.Xpo.v12.2.Web, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Xpo" TagPrefix="dx" %>
 
<%@ Register Assembly="DevExpress.Web.v12.2, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Web.ASPxGridView" TagPrefix="dx" %>
 
<%@ Register assembly="DevExpress.Web.v12.2, Version=12.2.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" namespace="DevExpress.Web.ASPxEditors" tagprefix="dx" %>
 
<!DOCTYPE html>
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="XpoDataSource1" KeyFieldName="UserID" Theme="Aqua">
            <Columns>
                <dx:GridViewCommandColumn VisibleIndex="0">
                    <EditButton Visible="True">
                    </EditButton>
                    <NewButton Visible="True">
                    </NewButton>
                    <DeleteButton Visible="True">
                    </DeleteButton>
                </dx:GridViewCommandColumn>
                <dx:GridViewDataTextColumn FieldName="UserID" ReadOnly="True" VisibleIndex="1">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="UserName" VisibleIndex="2">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="FirstName" VisibleIndex="3">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="LastName" VisibleIndex="4">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="MiddleName" VisibleIndex="5">
                </dx:GridViewDataTextColumn>
                <dx:GridViewDataTextColumn FieldName="EmailID" VisibleIndex="6">
                </dx:GridViewDataTextColumn>
            </Columns>
        </dx:ASPxGridView>
    </div>
        <dx:XpoDataSource ID="XpoDataSource1" runat="server" TypeName="XPOModel.DemoDB.Users"></dx:XpoDataSource>
    </form>
</body>
</html>

经过上述设置，主题并未生效，需要添加DevExpress.Web.v12.2.dll的引用

图九添加DevExpress.Web引用

此时点击Default.aspx进行浏览，打开的却是报错界面

图十默认数据库未能生成，报错（如果上述目录不存在，就会产生该错误）

这时，我们通过上面章节已经学习的方法，将Session与数据层绑定。

在Web.config中添加数据库连接的配置节

<connectionStrings>
  <add name="ConnectionString" connectionString="Data Source=.;Initial Catalog=DemoDB;user id=demo;password=demo;Integrated Security=false" providerName="System.Data.SqlClient" />
</connectionStrings>

修改Default.aspx.cs代码，将Session建立到数据层的绑定，并且设置XpoDataSource的Session

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using DevExpress.Xpo;
using DevExpress.Xpo.DB;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Init(object sender, EventArgs e)
    {
        string provider = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;//获取数据库连接
        IDataLayer datalayer = new SimpleDataLayer(XpoDefault.GetConnectionProvider(provider, AutoCreateOption.DatabaseAndSchema));//建立数据层XPO独有的
        DevExpress.Xpo.Session session = new DevExpress.Xpo.Session(datalayer); //将数据层和会话绑定
        XpoDataSource1.Session = session;
    }
 
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
}

选择Default.aspx页面，右键-在浏览器中查看

图十一数据绑定

图十二点击Edit（编辑）

编辑完成后，点击Update（更新），完成对数据行的修改。

图十三点埚New（新增），打开新增操作视图

同理，点击Delete，将执行数据行的删除操作，但是这个删除，没有提醒，我们可以增加行为。

<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" DataSourceID="XpoDataSource1" KeyFieldName="UserID" Theme="Aqua">
    <Columns>
        <dx:GridViewCommandColumn VisibleIndex="0">
            <EditButton Visible="True">
            </EditButton>
            <NewButton Visible="True">
            </NewButton>
            <DeleteButton Visible="True">
            </DeleteButton>
        </dx:GridViewCommandColumn>
        <dx:GridViewDataTextColumn FieldName="UserID" ReadOnly="True" VisibleIndex="1">
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="UserName" VisibleIndex="2">
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="FirstName" VisibleIndex="3">
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="LastName" VisibleIndex="4">
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="MiddleName" VisibleIndex="5">
        </dx:GridViewDataTextColumn>
        <dx:GridViewDataTextColumn FieldName="EmailID" VisibleIndex="6">
        </dx:GridViewDataTextColumn>
    </Columns>
    <SettingsBehavior ConfirmDelete="true"  />
    <SettingsText ConfirmDelete="确定删除吗？" />
</dx:ASPxGridView>